Genesis Invitational: Rory McIlroy four off leader Matt Kuchar

Rory McIlroy at the Genesis Invitational
McIlroy replaced Brooks Koepka as world number one earlier this week
Genesis Invitational first-round leaderboard
-7 M Kuchar (US); -4 KH Lee (Kor), R Henley (US), W Clark (US), A Schenk (US), H Varner III (US)
Selected others: -3 R McIlroy (NI), R Cabrera Bello (Spa), J Day (Aus), B DeChambeau (US), P Reed (US); -2 T Woods (US), B Koepka (US), P Casey (Eng), J Rose (Eng)
Full leaderboard

Rory McIlroy is four shots off the lead after the Genesis Invitational opening round in his first tournament since returning as world number one.

The Northern Irishman, back on top of the rankings for the first time in five years, carded a three-under-par 68 that included two eagles in California.

American Matt Kuchar holds a three-shot lead on seven under par.